Machine feed mechanism



Feb. 6, 1945. r. H. LJUNGGREN 2,

MACHINE FEED MECHANISM 7 Filed May l5, 1942 4 Sheets-Sheet l Feb. 6,1945. 9 T. H. LJUNGGREN 2,368,992

MACHINE FEED MECHANI SM Filed May 15, 1942 4 SheetsSheet 2 7272 a/ ym AI 1945- T. H. LJUNGGREN 2,363,992

MACHINE FEED MECHANI SM Filed May 15, 1942 4 Sheets-Sheet s Will/m.

Feb. 6, 1945.

T. H. LJuNG GREN MACHINE FEED MECHANISM 4 Sheets-Sheet 4 I Filed May 15,1942 Patented Feb. 6, 1945 MACHINE FEED MECHANISM Thor 'H. Ljunggren,Charlestown, N. H-., assignor .to Bryant Chucking Grinder Company,Springfield, Vt., a corporation of Vermont Application May 15, 1942,Serial No. 443,114

7 Claims.

This invention relates to the feeding of work and a tool relatively, andis particularly concerned with such feeding as applied to the grindingof work. In such machines it is usual practice to produce a rapidtraverse of the wheel on the work during the grinding operation.

It is an object of the present invention to present a gradual continuousrelative feed motion between the Work and the wheel without interferingwith and during this traverse. This feed may be produced by motion ofeither the work or of the wheel laterally of the line of traverse.

A further object is to produce the feed automatically at a predeterminedrate and to a predetermined extent.

Still another object is to provide for automatic retraction at the endof a grinding cycle preparatory to operation on a new work piece.

For a more complete understanding of this invention reference may'be hadto the accompanying drawings in which Figures 1 and 2 are top plan andfragmentary front elevations, respectively, of a grinding machineembodying one form of the invention.

Figure 1a is a detail section on line Ia-Ia Figure 1.

Figures 3 and 4 are fragmentary right han and rear elevations of thesame.

Figure 5 is a detail sectional view on line 5--5 of Figure 4.

Figure 6 is a detail sectional view on line B-6 of Figure 5.

Figure 7 is a view similar to Figure 6, but showing the partsindifierent positions.

Figure 8 is a detail sectional view on line 88 of Figure 6.

Figure 9 is a fragmentary view partly in elevation and partly in sectionshowing the traversing mechanism,

Figure 10 is a detail section on line '|Ul0 of Figure 1 showing feed asapplied to the work.

Figure 11 is a detail sectional View on line ll-ll of Figure 10.

Figure 12 is a view partly in side elevation and partly in verticalsection of the wheel head showing a modification of wheel feedmechanism.

Figures 13 and 14 are detail sectional views on lliles l3-I3 and |4- l4,respectively, of Figure Figure 15 is a diagrammatic view showing thecontrol mechanism for the feed shown as applied to the mechanism ofFigures 1 to 8, inclusive.

Refen'ing first to Figures 1, 2 and 3, at l is shown a machine bedhaving at one end a platform 2 on which is mounted for motion from frontto back, a work slide 3. This work slide may have any suitable means formoving it forwardly or backwardly in case it is desired to produce arelative feed between the work and tool by motion of this head. As shownit supports work holding means indicated at 4, this means including arotary work-carrying spindle for supporting a piece of work as at 5,this spindle being rotated as by a motor 6 carried by the casing of thework holding means 4 and connected to the spindle as by a driving belt"I. This work holding means may be adjustable angularly on the slide 3,for this purpose arcuate slots being shown at 8 for receiving suitablebolts securing the work holder holding means in position. At 9 are shownlongitudinally extending slots for attachment of a suitable truingmechanism indicated generally at [0 when a grinding wheel is the toolwhich operates on the work.

The machine base may be provided with a rocking support at l2 on whichmay be carried for rocking and axial motion a tool carriage M.

This tool carriage may support a transverse slide 15 carrying a grindingwheel head 16 within which is mounted a wheel shaft ll carrying agrinding wheel I8 for operating on the work.

The spindle (I may be rotated at high speed as by means of a belt l9passing around a pulley 20 at its rear end and connected to the drivepulley 2| of a motor 22 supported from the carriage l4. 7

This machine as so far described is of the type shown in the Arms Pat.No. 2,310,338 granted February 9, 1943, for Metal working machines andis not, per se, my invention, It is suflicient to say that the carriageI4 is moved axially to cause the wheel to traverse the'workand at theend of a grinding operation, the wheel slide is retracted into theposition shown in Figures 1 and 2 to bringthe wheel out from the work,

this being accomplished by hydraulic mechaameter portion 28 whichslidably fits within the tube 25 and forms a piston therefor. The shaft21 has reduced diameter end portions 30 and 3|. center of it passes apipe 32 which extends into the piston portion, 28 and communicatesthrough a port 33 to the interior of the tube 25 to the right of thepiston. The space outwardly of the The portion 30 is hollow and throughthe pipe 32 and between it and the inside of the shaft portioncommunicates through a port with the interior of the tube 25 at the lefthand side of the piston 2-8. The shaft portion 3I is solid in crosssection and is slid-ably guided through a sleeve 36 which engages alarger internal diameter portion of the tube 21 and forms a closed endto thepres sure cylinder containingthe piston 23 and zwhichitravelsrelative to the ,piston 28. The'rig'ht hand end of the tube 25 is openbut the left hand end is closed to the tube 32. When fluid is introducedthrough the pipe 32 and discharged around the pipe 32 and :out.:throughthe pipe 37, the pressure cylinder 25 andthe tool carriage is moved tothe right, while'when fluid under pressure supplied tothepipe'3Landallowed to escape through the pipe '32, "thetool slide is moved to theleft or toward the work spindle.

Suitable means (not shown herein "but'"well known ,in the tart) ;mayi.bepro.vided .for control- :ling thesupplyand discharge.ofgfluidzunderpres- .sure to opposite x-sides cof the piston 23 .-.to control .thetraverse 10f the grinding wheel With :reference to. the work betweennormalgrinding limits, 3

and .t produGe-an extendedtraverselofthe, grind- .ing wheel beyondoneof-suchdimitsoutreoperative =relation :to {the work (as at the send.of ;a grinding cycle.

.-It will betevident-that a=feed motion of the ,grinding wheel withreference to .the work :may :be :produced by rocking -the-carriage .14about the axis -of .the tube '25, which .is :eccentrie etO-.the-workingcontaet between .the wheel and .the

work, pandrmeans .-for accomplishing the ifeedby such method is :shown.-in Figures 4 :to .8, inclusive. IIheJoed I .is; provided wi-than ;arm'4 llalong .itsiback gportion, this .-arm 40 being arranged r110 supportarcamgplate A l. .As.-,shown\best in Eig- -.ures3land4l,.thiscamgplatenlI may hezsupported adjacentetcxopposite endsonqadiustingscrews 42, landiit .imay beheld in -,adjusted p.osi-tion .asby :means of .set screws 43 threaded through .the .back wall portion 44'of asocket .slot A5 :in .the

Stop face of Lthe arm lI), .these screws 44 bearing ragainstithe :camplateM ande'forcing it against .theiinner walliofitheslotA-ti,,'-I'oitherreari'extremity ,of thecarriage I4 is :se-

cured, :as bynscrews s59, spacedbrackets 5I ;hav-

ing spaced upright .fins :52, ,between which :is

theouter .endiof .theslide AD as by .the screws TBL.

.ili'he wedge ..cam .60 maybe -heldin positionas by ,a cover ,plate 19 aas .shown .inIigui-e L8, -and it .may .be secured Lto the ,=piston .rod.6 I as Joy ..a "reduced .diametier portion II of $.the -rod .extenrlingthrouehahole lzofithe .wedge-hamandmav- J. i

.ing a mm, .13 lthreaded on its .o1iter extremity. ='I?his,nut1'3maysalso seourelin posttiona'lbracket I5 carrying easwitch actuatingelement 16 .the purpose of which wilLlater .be described.

.iI'he outer end of =.the..c,ylinder .fifisrnay-hetclosed. off as byalcylinderheadiw, andpipes .81 wandBZ leading through v,the head .39.and the cylinder \wall, respectively, .may .be employed .to conductfluid [under pressure .intobrv discharge fluid ,pressure fromsoppos'ite.end portions of the tcylinder beyond the piston 62. It will be notedthat the end of the wedge cam adjacent to the piston rod BI is narrowerthan that end further remote therefrom. When the wider portion of thewedge cam bears against the block 53, as in Figure 6, the rear end ofthe carriage I4 is held in a somewhat elevated position with thegrinding wheel forward at the start of the grinding operatiomibut as thepiston is: moved .toazthe right from the position of Figure 6'to'that ofFigure '7, the narrower portion of the wedge cam 60 engages the block53, allowing the rear end porrtionrofztheqcarriage I4 to drop and movingthe grinding wheel rearwardly, feeding it into the work.

Means may tie-provided as shown in Figure 15 to produce this'fee'dmotion of the grinding wheel :rel-ativeztolthe'work during the operativetraverse between the wheel and the work and to a predetermined extent,the wheel then being returned :to its .initial .tfeed positionautomatically. on .,:the extended :traversenf the wheel which brings it.-n11 t \of iqperative relationmo the work, .as .at the (end 1.01? z-aggrinding operation, the finished work is taken .from the machine'aandan un ground-pieceaof work.-substitutedrtherefor, upon which .the.nextgrindin -operation is to be;periformed. ..-Referr-ing-.to .Figure 1-5,the pressure ,pipes 8| .and.-&2.leadeto:avalvecasing within which ismovable a. valve 9| normally' downwardlygpressed in the:.casingSO-sasbvmeansof .aspringz92. In :the position shown in Figure 15, thispiston.92 .is.1ifted .as tfar .aszpermitted by a head 93 .thereon whichengages a shoulder '94 of the valve casing, and it is .heldin thisposition Joy fluid pressure .admittedibeneath the piston 9| as through apipe v95 leading from a valve casing 596 within .which is :axiallymovable a valve .91. :In .thepositionvsho wnthis {valve 91 is .lifted.so that an :annular recess 9.8 therein opens communication to thepipevliifromapressuresupply pipe .99. When .the valve 9| :isin its uppergIJOSiitOlfl as shown, .a branch I09 leading fromithepressure-pipe. 99communicates through .the-acasingafl around(a,-neck;portion IIJIlllofthe valve 9| to the pipe 8I, while the pipe 82 .com- \municates around avalve neck IIII to thedischarge pipe I02 .havingan adjustable valve I03,therein by which @the, rate;of discharge-of fluid under pressure may becontrolled. This causes the ,piston 62 zto'heldrivenrfrom its positionof Figure 15 toward the right at a speed dependent .upon the setting of:the valve I1ll3 to produce a gradual .feedeof thergrinding wheel intothework. .Thispersists .until the .switch actuating element I6 strikes aswitch arm- I05, closing ,thecontacts I I16;r and 1-01. ELhis; makes: anelectricah connection from :the line 1.08, the main .switch .at I09being closed, through the leads H40 and II-I, .the contacts 496 .andIll! \of -:.the switch I II, throughha-ssolenoidlI2rof arelay :I-I 3,:anarm I l'4 .of this relay, ;and lleadalrlli back through :the switch I09to the line IIB. Theactuation of the :solenoid .LI-2 throws :over thearmature vswitch arm .HB .toward thee-solenoid llz breaking-itheconnectionjzo the arm .Im andclosingtaiconnectime .|.'2.D\Qf-the-solenoid .lZI tandppeninga :con-

itact =I 2 2 leading-from the lead I- I 5. contact [22 is in circuitthrough a lead I23 with a sole- -noid .124 .anda. lead .L25 .to \thelead I-I 0,;so zthat the :opening .of the contact 122 deenergizes thesolenoid J24, .allowing the .valve .91 to :drop. thus cutting o'fi thepressure to the pipe 95 and open- .ing..-this pipe 95 toufreerdischargethrough :the pip i I30. This allows .thervalveiaI \totdrop, -.cut

suitable worm gear I16 connected for rotation ting oil the pipe 8I fromthe pressure line I and opening the pipe 82 to this pressure line, whileopening the pipeBI to the discharge pipe I 3| which by-passes the valveI03 to free discharge. Thus the piston 62 is returned rapidly to theposition of Figure 15 in position to start the next cycle of operations.

After the extended traverse of the wheel slide has been produced and theslide starts back toward the work, a switchactuating element I35 on thewheel carriage depresses a switch arm I36, making" an electricalconnection between the contacts I31 and I38. ,The switch actuatingelement I35 is free to tilt out of the way on the extended outwardtraverse so that at that time it does not actuate the switch arm I 36. Astop I350 holds the element I35 in position to depress the arm I36 onreturn of the wheel slide. This establishes an electric connection fromthe lead H0 and lead I39, the contacts I38 and I31, and lead I40,extending to the left hand solenoid I2I of the switch H3, and as theprevious energiz'atioriof the solenoid H2 served to close the contactI20 with the switch arm II4 and lead II to the line I I6, this againenergizes the solenoid I2I and re-j- Feed between the wheel and the workmay bev effected, if desired, by motion of the work carriage 3 ratherthan'by motion of the wheel slide, and mechanism for accomplishing thefeed in this manner is illustrated in Figures and 11. Referring to" theconstruction shown in these figures, the work slide 3 carries a bracketI50 provided with a yoke member I5I which extends rearwardly beneaththecarriage 3. The forward wall of the bracket I50 is provided with anopening within which is seated a bushing I52 and journaled therein andheld against axial motion is a feed shaft; I 53 having a rearwardsplined extension I54. This extension projects within a feed sleeve I55having inwardly extending portions I56 engaging in the grooves of theexterision I54 so that relative axial motion between the parts I54 andI55 is permitted while they are prevented from independent rotation. Byrotating the feed shaft I53, therefore, it will be evident that thesleeve I55 will also be rotated. This sleeve I55 is externally threadedand has threaded engagement with a nut member I 59 whichis secured tothe forward face of the bed I as ,by

means of screws I51 extending through ,a downwardly extending flange I58of the nut I59 and into the forward portion of the base I. The innerwall of the yoke member I5I carries a guide block I60 having ahorizontal groove I6I therein within which rides a wedge cam I62. Theopposite edge of the wedge cam engages a wear piece I 63 in the innerend of the sleeve I55. The guide block IE0 is held into engagement withthe wedge cam I62 and the wedge cam in engagement with the wear pieceI63 by means which urges the work slide 3 forwardly in feedingdirection. This as, shown is accomplished by a weight I65 fixed to theend of a cable I66 which extends through a hole I61 in the top of thebase I, over a guide pulley I68 and under a guide pulley I69, bothjournaled in a bracket I10 secured to the top face of the bed I, andthen to a post I12 depending from the work slide 3, to which post theother end of the cable is secured.

The feed shaft I 53 may carry'a hand wheel I at its outer end and it mayalso carry a by a worm I80 (see Figure 1a) on a transverse I80 may belowered intoengagement with the worm wheel I16 in which case by itsrotation the shaft I53 may be slowly rotated, or lifted so that I theshaft I53 may be rotated at a faster rate by rotation of the hand wheelI15. When the worm is in its lowered position itlocks the shaft I 53against rotation by the hand Wheel I15.

The wedge cam I62 may be arranged to be traversed during the operationof the wheel (on the work to produce feed motion, this being shown asaccomplished by the fluid pressure cylinder 6511. containing the piston62a connected to the piston rod 6| a, this piston rod being providedwith a shaft extension 120. extending through the cam. I62 and securedas by a nut 13a engaging the threaded outer end of the member 12a. Thiscylinder 65a may be connected up to-the'mechanism shown in Figure 15 inplace of the cylinder 65 shown in that figure and the wedge cam I62 maybe provided with an actuating. element 16a for engagement with theswitch II1.

The feed may also be produced by motion of the wheel slide I6 forward orbackward relative to thecarriage I4. Such an arrangement is illustratedin Figures 12 to 14. The wheel lide I5 may be provided with a dependingportion 200.

which. extends down between ways 20 I upon which the slide I5 ismounted, This depending portion 200 may have fixed transversely thereofa pin 203 having a hardened head 204 which engages one edge' face of awedge cam 205. The opposite edge of the wedge earn 205 is guided in anotch 206 of a block 201 secured to a flange 208 upstanding from thebase of a channel shaped member 2I0,-the side flanges of which form theways 20I. The slide I5 is pressed toward the flange 208 by any suitablemeans such as the weight 2I2 attached to a cable 2I3. This cable 2I3passes over a guide pulley 2I4 carried by a bracket 2I5 secured to theflange 208 and is secured as'by an eye bolt 220 to the depending portion200. Movement of the wedge cam 205 to bring its narrower portion betweenthe members 201 and 203 permits the weight 2I2 to move the grindingwheel transverse to its axis to effect feed of the wheel with referenceto the work; A switch actuating element 22I secured to thewedge cam mayimpinge upon the switch I I1 at, the limit of feed as in Figure 15 andthe feed motion of the feed cam may be produced by the pressure cylinder65b having the piston 62b and the piston rod 6Ib which may be connectedinto the system in place of the cylinder 65 and piston 62 and rod 6I ofFigure 16, thus to control the cycle of the feed in the same manner thatit can be controlled by rocking the wheel carriage I4 or by motion ofthe work carriage.

From the foregoing description of an embodiment of this invention, itshould be evident to thoseskilled in the art that various changes andmodifications might be made without departing from the spirit or scopeof this invention.

7 I claim:

I 1. The combination with a pair of members, one of said memberssupporting work and the other of said members supporting a tool, movingmeans, connections between said moving means and one of said memberscausing movement of said moving means in one direction to producemelative feeding :motion lbetween 'saidr'members, sand 'infanotherdirection "to :produce relative re- ;traction between said members, Fatransverse wedgei'member in saidxc'onnections, means:acting to :pro'ducerelativeItraverse between said memvb ers transverse i to v1 eedin'gdirection, and means fo'r rzantomaticall :moving said wedge :mem-berendwiseina rectilinear pa'th during the-traversins-action of-the too1 onthe' work. I

2.-"The combination =with -a pair 0f members, "one of said memberssupporting work and the other of' said members supporting a tool, moving-means, connections between said moving m'eans and-one of said memberscausing movement "of ss'aid' moving means in one direction to producerelative feeding motion 'between'saidmembers, and in another directionto producerelative retraction between said members, a transverse wedgemember in said connections, means acting to produce relative traversebetween said ."mem- 'bers transverse to feeding :dire'ction, fluidpressure mechanism for movingsaid wedgemember *endwi'se in arectilinear-path during thetraversine-action of the tool on'the work,'and'anelec- 'triccontrol'for said fluid pressure mechanism.

- 3. Thecombination .with a pair of -members, one of said memberssupporting work and itlie other of said members supporting a tool,-means "for relatively reciprocating said members tocause the tool 'to'traverse the work between normal -traverse =limits, and beyond one ofsaid limits threug'h -an 'extended traverse wherein said tool 'issspacedfrom the work, means for producing a 1 relative motion of saidmemberstransverse'to the direction of reciprocation to causeife'e'd and re-'traetion'of the tool relative-to the work,rlectri'cal means forcontrolling said feed motion-including a limit switch for stopping thefeed motion'ata preda-iermined. point and setting said members=1'elatively't0 a startingfeed'position, and'switch' fisaid ream :platertorniove :said s'slide :in accordance with athe 'eontour of said vcamaplate itoceffect :a relative sfeed E motion between work onzssaidwork supporting:memberrandra toolnonusaidztool sup- :cam, a Wedge ca'mbetweenisaidlfollower zandrav ,portionof isaid pivotally mounted member,wand means ifor moving-said :wedge cam to movewsaidfollowerrwith;referencetorsaidgpivotally:mounted membe'r. I

' i6..In combination, a base, a JibarI-rockablyiand axially 'slidableSon said base, a member :s'e'cured .to said itbar, a 1 member carried byi said base, one of said members fsupporting 'WOIk "and the "other "of:said timembers :supporting a tool 'for: operating on .sai'dxwork,r.aformer'cam "carried by said base and arranged parallel ito'said bar,'a'ffollower f for saidr'lcam imovably Icarried by "said bar-carriedmember, means :for lreciprocating said 'bar-icar- Irie'd rmemb'er withsaid '.ba'r, the angular position of said Ibar-carrled member beingdetermined partly. by engagement :of said follower .on said former cam aWedge'camarranged between :said cam ifollower :and bar -carried member,:and means for 'movingisaid wedge cam *to move'i'said follower withrelation to :said'b-ar-"carried mem- 'ber.

7 .In combination, a-s1id'e,a yoke movable with :saidi'slicleia' fixednut, 'a 'threadedfsleeve iarran-ged 'withi'its axis inithe direction-ofmotion of said nut, Ta 1 shaft isplined to and within saidfisleeve, Fatransversely arranged caml plate between one "end of said; sleeve-andsaid zyoke,.means pressing said being a-sIide, a'yoke movable with saidslide,a

"fixed 'nut, a threaded'sleeve arranged-'inthediilyoke in a direction"to hold "said :sleeve, against said foam plategmeans fo'r rotating-saidshaft to t 'move :fsaid slide, .and ameans operatively engaging said camplate andactuable to move said cam plate transverse to :said shaft to:move 'said "slide independently a of :themotion of :said'slide fcausedbyYrotation ofsaid shaft and'in accordancewith =the c'ontoimoi: saidcamiplate.

THOR 'ZLJUNGGREN.

